Saw-guard



J. H. BURKE.

s w sumo. A PILICATION FILED MAY'ZZ, 1920- '1,383,285. Patented July 5, 1921 Inventcfl: Jlwvh R. BMRL UNITED STATES PATENT OFFICE.

JOSEPH H. Bearis or ronrnann Marni].

SAW-GUARD.

Application filed May 22,

To all w 7mm it may concern Be it known that I, Josnrrr II. BURKE, a citizen of the United States, residing at Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Saw-Guards, of which the following is a specification.

My invention relates to saw guards for protecting circular saws and the invention is particularly directed to an improved con struction of the saw guard as shown in my application N o. 337 ,074, filed Nov. 10, 1919.

In the above named application I made use of a depending hollow tube which held a rod, on the lower end of which was a lateral projection terminating in a depending bar or rod which supported on its lower end the hood or saw guard proper.

The device was so constructed that the vertical rod could slide vertically and revolve in the supporting tube so that the guard could be lifted with one hand, turned to a position entirely removed from the saw and clamped in its new position by the other hand of the operator, making a quick and easy adjustment.

The difliculty with this device was that when the hood which covered the saw was placed suliiciently low to just clear the upper surface of the stock, which was its preferable position, any increase in thickness of the stock was liable to cause it to bind on the lower edge of the hood and thus interfere with the free operation of the saw.

According to my present invention I mount the hood in such a way as to have a free vertical motion so that all binding by the stock is prevented as the guard is automatically lifted when an extra thickness is run through the saw.

As I preferably construct the device the weight of the guard and its attached partsv are partially counter-balanced so that the guard is easily lifted but it has suilicient weight to keep a light pressure 011 the top of the stock at all times.

I have illustrated n y invention in the accompanying drawing in which is shown a saw guard embodying the preferable form of my invention.

In the drawing:

Figure 1 is an elevation looking at the saw edge-wise and, Fi 2 is an elevation taken at right angles to ig. 1.

Referring to the drawing:

1 indicates the depending hollow tube by Specification of Letters Eatent. Patented July 5, 192 1.

1920. Serial No. 333,386.

which the device is supported, 2 is the supporting rod fitting in the tube 1 and rotatable and slidable in said tube, 3 is the hand clamp, l is the saw, 5 is the machine table and (.3 is the hood or saw guard proper.

These parts are all substantially the same as set forth in my said application.

According to my present invention, as here shown, I secure to the top of the hood (3 a supporting bar 7 which passes through a vertical socket 8 secured to the end of the offset which projects from the lower end of the rod 2.

The rod 7 is square where it passes through the sleeve or socket 8 to prevent lateral turning. A pin or stop 9 holds the bar 7 and the hood from dropping onto the table and the whole apparatus may be raised and lowered by raising or lowering the rod 2 and clamping it in position by the clamp 3.

The hood and its bar 7 are partially counter-balanced by a cord 10 and weight 11, the cord passing over a pulley or truck 1.3 pivoted on an arm 12 which extends out from the tube 1 or other suitable support.

The principal weight is thus lifted from the hood and bar and the hood will in use rest lightly on the stock as it passes through the saw but will readily lift when work of extra thickness passes through.

One great advantage of this arrangement is that the hood rests always on the work holding the same down and in position so that the saw does not have to be kept clear of strips as they are sawed as under the old arrangement, for fear that the strip will be caught by the saw and thrown.

Thus when a number of strips are fed in one aft-er another no attention need be paid to see that the saw is always clear as the weight of the hood holds them firmly in place.

The hood may be raised and swung out of the way as in my old device and the present device hasthe additional advantage of taking various thicknesses and of holding the work down.

The front end of the hood is slightly turned up so as to readily admit strips of greater thickness than the guard is set for.

A plurality of holes may if desired be made in the bar 7 to receive the pin 9 so that the bar and the hood may be stopped in different positions to conform to the thickness of the stock passing through the saw. There are thus two means of Vertical adjustment,

the pin 9 and the rod 2 held in place by the clamp 3.

I claim:

1. In a saw guard mechanism, the com- 5 bination of a depending post, a rod slidably and rotatably connected with its lower end, said rod having a lateral oiffset at its lower end, a vertical socket on said ofiset, a sliding bar in said socket, a hood carried by said bar and means for partially counter-balancing the weight ofsaid bar and guard.

2. In a saw guard mechanism the combination of a depending post, a. rod slidably and rotatably connected with its lower end, said rod having a lateral offset at its lower end, a vertical socket on said offset, a sliding bar in said socket, a hood carried by said bar, an arm projecting from said .post, and a cord and counter-weight connected with said arm fer-partially counter-balancing the Weight of said bar and hood.

In testimony whereof I have affixed my signature.

JOSEPH H. BURKE] 

